Adjective
Full of knots; gnarled.
Milled, as the head of a screw, or the edge of a coin.
Source: Webster's dictionaryA knurled wheel controlled a copper flap in front of the lens, which functioned as a shutter. Source: Internet
Clutch The standard clutch uses a knurled collar partially threaded below the cymbal and a pair of knurled rings above it. Source: Internet
Sometimes vernier markings. ; Lock nut / lock-ring / thimble lock: The knurled component (or lever) that one can tighten to hold the spindle stationary, such as when momentarily holding a measurement. Source: Internet
It's bare polycarbonate with a knurled texture, but doesn't grip as well as rings covered in rubber. Source: Internet
The top of the L1 features a large knurled aluminum rotary volume control, a 3.5mm single-ended output, a four-pin balanced mini-XLR output. Source: Internet